I have a 2008 Nissan Versa. Over the past few months I have began to notice that when at an idle either parked or at a stop light etc. If I roll down/up the window the RPM lowers (usually about 200 RPM) and the engine vibrates heavily. Any idea why this electrical draw would do this? I do have bad engine mounts and actually am picking them up tomorrow as I had them ordered in but not sure why the window would do this.